Yes, I would like to receive future marketing communications (such as email) from Caterpillar Inc., its affiliates and subsidiaries worldwide and the Caterpillar dealer network. Regardless of whether you decide to receive these marketing communications, Caterpillar will continue to send service/transactional messages, including those that have to do with any accounts that you may have with us.

Overview

The Cat® CTS Series Automatic Transfer Switch(ATS)is configurable for applications requiring the dependability and ease of operation found in a full featured power contactor type transfer switch.The CTS Series is equipped with the MX250 controller that is designed for the most demanding transfer or bypass switch applications.

CTS Series Automatic Transfer Switch Standard Equipment

The Cat CTS Series of Automatic Transfer Switches

The Cat CTS Series power contactor type transfer switch makes use of a fully programmable / configurable microprocessor-based controller to allow the utmost in application flexibility. Further, the CTS Series is offered in a wide array of configurations enabling it to meet the needs of even the most highly critical load.Available configurations include:

40-4000 Amps:

CTS Automatic Transfer Switches

CTSD Delayed Transition Transfer Switches

CTSM Manual Transfer Switches

100-4000 Amps:

CTSCT Closed Transition Transfer Switches

CBTS Automatic Transfer/Bypass Switches

CBTSD Delayed Transition Bypass Switches

CBTSCT Closed Transition Bypass Switches

All CTS products meet or exceed industry requirements to allow specification and installation with confidence.

This ruggedly built family of power contactor switches has been specifically designed for transfer switch duty with dependability, versatility and user friendliness of prime concern.The CTS power panel components, consisting of power switching contacts, drive mechanism and terminal lugs, are mounted on a specially formed backplane. Logic devices including microprocessor control auxiliary time delays and special accessory equipment are assembled on the door for ease of maintenance and separation from the power section. They are connected with a numbered wiring harness equipped with a disconnect plug that allows isolation of the control panel for maintenance.

CTS Series Method of Operation

When the normal source fails or the voltage drops to a predetermined point (usually 80% of nominal), if required, a circuit is closed to start the engine generator set. When the emergency source reaches 90% of rated voltage and 95% of rated frequency, the drive solenoid is energized through the emergency coil control relay, causing the main contacts to disconnect the load from the normal source and connect it to the emergency source. After the drive solenoid has completed its electrical stroke and is seated, the emergency coil control relay opens to disconnect it. The transfer switch is now mechanically locked in the emergency position. When normal voltage is the normal source and connect it to the emergency source. After the drive solenoid has completed its electrical stroke and is seated, the emergency coil control relay opens to disconnect it. The transfer switch is now mechanically locked in the emergency position. When normal voltage is and is seated, the coil control relay opens to disconnect it. The transfer switch is now mechanically locked in the normal position.

Drive Mechanism

All CTS switches employ the simple “over-center” principle to achieve a mechanically locked position in either normal or emergency and a high speed drive assures contact transfer in 100 ms or less. High contact pressure and positive mechanical lock allow for high withstand and closing ratings, far exceeding UL requirements.